Performance evaluation of IEEE 802.16d ARQ algorithms with NS-2 simulator

In this paper, we evaluated the performance of 4 types of ARQ algorithms of IEEE 802.16d that have been adopted to offer reliable transmission at the MAC level. First of all, we implemented IEEE 802.16 ARQ algorithms with using NS-2 network simulator and then evaluated those performances in various channel conditions. We chose two measures for performance evaluation. First, we used the total number of ARQ blocks in bytes that have been received without error. Second, we used ACK_efficiency that was newly defined in this paper. With the results of simulation, we could be aware that each ARQ algorithm provides different performance under various channel states. Thus in order to improve the transmission data rate in a specific channel state, we should choose the appropriate ACK interval as well as a suitable ARQ algorithm